Surface-enhanced Raman scattering in graphene deposited on Al$_x$Ga$_{1-x}$N/GaN axial heterostructure nanowires

Aleksandra Krajewska; Aleksandra Przew{\l}oka; Andrzej Wysmo{\l}ek; Aneta Drabi\'nska; Grzegorz Kowalski; Jakub Kierdaszuk; Krzysztof M. Czajkowski; Maria Kami\'nska; Marta Sobanska; Mateusz Tokarczyk

arxiv: 1808.02080 · v1 · pith:NTN5UJ6Onew · submitted 2018-08-06 · ❄️ cond-mat.mes-hall

Surface-enhanced Raman scattering in graphene deposited on Al_xGa_(1-x)N/GaN axial heterostructure nanowires

Jakub Kierdaszuk , Mateusz Tokarczyk , Krzysztof M. Czajkowski , Rafa{\l} Bo\.zek , Aleksandra Krajewska , Aleksandra Przew{\l}oka , Wawrzyniec Kaszub , Marta Sobanska

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Zbigniew R. Zytkiewicz Grzegorz Kowalski Tomasz J. Antosiewicz Maria Kami\'nska Andrzej Wysmo{\l}ek Aneta Drabi\'nska

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classification ❄️ cond-mat.mes-hall

keywords grapheneramanaxialdepositedheterostructuremechanismnanowiresscattering

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The surface-enhanced Raman scattering in graphene deposited on AlxGa1-xN/GaN axial heterostructure nanowires was investigated. The intensity of graphene Raman spectra was found not to be correlated with aluminium content. Analysis of graphene Raman bands parameters, KPFM and electroreflectance showed a screening of polarization charges. Theoretical calculations showed that plasmon resonance in graphene is far beyond the Raman spectral range. This excludes the presence of an electromagnetic mechanism of SERS and therefore suggests the chemical mechanism of enhancement.

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Surface-enhanced Raman scattering in graphene deposited on Al_xGa_(1-x)N/GaN axial heterostructure nanowires

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